Determining Touch Applied to an Ultrasonic Sensor

2. The method of claim 1, wherein the first data comprises at least one characteristic of the first reflected ultrasonic signal along a predefined axis, and the second data comprises the at least one characteristic of the second reflected ultrasonic signal along the predefined axis.

3. The method of claim 2, wherein the at least one characteristic represents the feature of the finger derived from at least one of the first reflected ultrasonic signal and the second reflected ultrasonic signal.

4. The method of claim 2, wherein the predefined axis is perpendicular to a surface of the ultrasonic sensor, and wherein the first data and the second data represent the at least one characteristic as a function of depth.

5. The method of claim 2, wherein the determining a signal change due to the change in the feature of the finger during the touch interaction with the ultrasonic sensor is based at least in part on a difference between the at least one characteristic of the first data and the at least one characteristic of the second data.

6. The method of claim 1, wherein the determining a signal change due to the change in the feature of the finger during the touch interaction with the ultrasonic sensor is based on at least one of a deformation of the feature of the finger, and a displacement of the feature of the finger.

7. The method of claim 1, wherein the first data comprises at least one image and the second data comprises at least one image.

11. The method of claim 1, wherein the feature of the finger comprises a layer of the finger.

12. The method of claim 1, wherein the feature of the finger comprises a transition between layers of the finger.

13. The method of claim 1, wherein the feature of the finger comprises a feature within a layer of the finger.

14. The method of claim 1, wherein the feature of the finger comprises a feature traversing layers of the finger.

16. The electronic device of claim 15, wherein the processor is further operable to detect a fingerprint of the finger based at least in part on one of the first data and the second data.

18. The electronic device of claim 15, wherein the processor is further operable to determine a force applied by the finger to the electronic device based at least in part on the touch applied by the finger to the electronic device.

20. The sensor processing unit of claim 19, wherein the sensor processor is further operable to determine a force applied by the finger to the electronic device based at least in part on the touch applied by the finger to the electronic device.